Exhaust Manifold Recommendations - 1972 GMC K1500 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Portland68** · 07-26-2019, 01:28 AM

Looking for recommendations for exhaust manifolds for my 72, dad and I pulled the motor for a rebuild and one of the stock ones had a major crack so I'm looking to upgrade a little bit.

I've been looking at the ram horn style center dumps but was curious what members thought and if my options were limited because the truck is a 4x4.

Thanks!

edit: Looks like my picture uploaded sideways again but there she is last year after a fresh brush on clear coat - good from 20 feet!

Mike C · 07-26-2019, 07:39 AM

The smaller 2” exit center dumps were factory on the K1500. I would encourage a set of the reproduction Corvette 2 1/2” outlet manifolds.

On a mild motor, they make power equal to a set of 1 5/8” headers IME. And come with none of the hassles.

I used two passenger side manifolds from a 64-65 ‘vette if I remember and I cut the generator mount off.

**Grumpy old man** · 07-26-2019, 08:34 AM

2 1/2" rams

https://www.summitracing.com/parts/sum-g9200n

**A1971Blazer** · 07-26-2019, 08:38 AM

Quote:

Originally Posted by Grumpy old man

2 1/2" rams

https://www.summitracing.com/parts/sum-g9200n

I removed the junk headers on my '70 K/5 Blazer and installed a set of these....the fit was exact and nary a leak in 3 years..

**Grumpy old man** · 07-26-2019, 09:05 AM

I'm using the chrome 2 1/2" rams

07-26-2019, 01:28 AM	#1
Portland68 Active Member Join Date: Apr 2017 Location: Portland, Oregon Posts: 186	Exhaust Manifold Recommendations - 1972 GMC K1500 Looking for recommendations for exhaust manifolds for my 72, dad and I pulled the motor for a rebuild and one of the stock ones had a major crack so I'm looking to upgrade a little bit. I've been looking at the ram horn style center dumps but was curious what members thought and if my options were limited because the truck is a 4x4. Thanks! edit: Looks like my picture uploaded sideways again but there she is last year after a fresh brush on clear coat - good from 20 feet! Attached Images

07-26-2019, 07:39 AM	#2
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,723	Re: Exhaust Manifold Recommendations - 1972 GMC K1500 The smaller 2” exit center dumps were factory on the K1500. I would encourage a set of the reproduction Corvette 2 1/2” outlet manifolds. On a mild motor, they make power equal to a set of 1 5/8” headers IME. And come with none of the hassles. I used two passenger side manifolds from a 64-65 ‘vette if I remember and I cut the generator mount off. __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

07-26-2019, 08:34 AM	#3
Grumpy old man Senior Member Join Date: Dec 2013 Location: Gods country East,Tn Posts: 8,545	Re: Exhaust Manifold Recommendations - 1972 GMC K1500 2 1/2" rams https://www.summitracing.com/parts/sum-g9200n __________________ 1967 Factory short bed - Old school '71 - 350 / 4bolt / 487 heads / Edelbrock C3BX Muncie M-22 4 speed / Hurst Comp plus Factory 12 bolt posi 3.73 / 255-70-15 Smoothed firewall / Factory cowl induction Power disc brakes / power steering / 3.5-5" drop

07-26-2019, 09:05 AM	#5
Grumpy old man Senior Member Join Date: Dec 2013 Location: Gods country East,Tn Posts: 8,545	Re: Exhaust Manifold Recommendations - 1972 GMC K1500 I'm using the chrome 2 1/2" rams Attached Images __________________ 1967 Factory short bed - Old school '71 - 350 / 4bolt / 487 heads / Edelbrock C3BX Muncie M-22 4 speed / Hurst Comp plus Factory 12 bolt posi 3.73 / 255-70-15 Smoothed firewall / Factory cowl induction Power disc brakes / power steering / 3.5-5" drop

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